Condition in which obscuring phenomenon restricts horizontal visibility to six statute miles (10 km.) or less.

All control line that still contains the fire when mopup is completed. Excludes lost line, natural barriers not backfired, and unused secondary lines.

Particulate matter of mass median aerodynamic diameter (MMAD) less than or equal to 10 micrometers.

The ICS title for individuals responsible for supervision of a branch. Also, an organizational title for an individual responsible for managing and directing the team in an EOC.

The smallest area that a wildland fire investigator can define based on the physical evidence of the fire pattern indicators, within the specific origin area, in which a competent ignition source came into contact with the first fuel ignited and combustion was sustained.

A fuel complex defined by kind, arrangement, volume, condition, and location that presents a threat of ignition and resistance to control.

A chance of suffering harm or loss.

Assess hazards to determine risks. Assess the impact of each hazard in terms of potential loss, cost, or strategic degradation based on probability and severity.

Specially designed bucket carried by a helicopter like a sling load and used for aerial delivery of water or fire retardants.

Rapid fluctuations in wind speed with a variation of 10 knots (11.5 mph) or more between peaks and lulls.